Health status of an elderly population in Sharpeville, South Africa.
The objective of this cross-sectional study was a comprehensive nutrition and health assessment to provide a basis for future intervention strategies for an elderly population attending a day-care centre. Socio-demographic, health and 24-hour recall dietary intake questionnaires were administered and anthropometric and biochemical measurements taken. The results indicate that the majority of respondents had an income of between R501 and R1 000 (South African rand) per month and most of them reported an occasional lack of funds to meet basic household needs, confirming the presence of food insecurity. Daily dietary intakes (mean [+ or -] Standard Deviation [SD]) of the women were 5 395 [+ or -] 2 946 kJ energy, 47 [+ or -] 27 g protein, 28 [+ or -] 21 g fat and 196 [+ or -] 123 g carbohydrates compared to 8 641 [+ or -] 3 799 kJ, 86 [+ or -] 48 g, 49 [+ or -] 32 g and 301 [+ or -] 139 g of the men, respectively. The majority (83.6%) of the women were overweight (body mass index [BMI] [greater than or equal to] 25) or obese (BMI [greater than or equal to] 30) whilst 78% had a mid-upper arm circumference (MUAC) of [greater than or equal to] 21.7 cm. Mean intakes of micronutrients were low in comparison to reference standards and serum zinc levels were suboptimal. Obesity, hypertension and raised total serum cholesterol levels indicated an increased risk for coronary heart disease. It can be concluded that a low income, household food insecurity and risk factors associated with malnutrition and non-communicable diseases were prevalent in this elderly population.
Keywords: elderly; health; nutritional status; low income; household food insecurity
Die doelwit van hierdie dwarssnitstudie was 'n omvattende bepaling van voeding- en gesondheidstatus om as basis te dien vir toekomstige intervensiestrategiee vir 'n groep bejaardes wat 'n dagsentrum besoek. Sosiodemografiese, gesondheid- en 24-uur herroep-dieetinname vraelyste is voltooi en antropometriese en biochemiese metings is geneem. Die resultate het bevestig dat die meerderheid respondente 'n maandelikse inkomste van tussen R501 en R1 000 (Suid-Afrikaanse rand) gehad het. Die meeste het 'n geldtekort vir basiese huishoudelike behoeftes gerapporteer wat dui op huishoudelike voedselinsekuriteit. Daaglikse dieetinnames (gemiddeld [+ or -] standaardafwyking [SA]) van die vroue was onderskeidelik 5 395 [+ or -] 946 kJ energie, 47 [+ or -] 27 g proteien, 28 [+ or -] 21 g vet en 196 [+ or -] 123 g koolhidrate in vergelyking met 8 641 [+ or -] 3 799 kJ, 86 [+ or -] 48 g, 49 [+ or -] 32 g en 301 [+ or -] 139 g vir die mans. Die meerderheid (83.6%) van die vroue was oorgewig (liggaamsmassa-indeks [LMI] [greater than or equal to] 25) of vetsugtig (LMI [greater than or equal to] 30) en 78% het 'n middel-bo-armomtrek (MUAC) van [greater than or equal to] 21.7 cm gehad. Gemiddelde mikronutrientinnames was laag in vergelyking met die verwysingstandaarde en serumsink was suboptimaal. Vetsug, hipertensie en verhoogde totale serumcholesterolvlakke het op 'n verhoogde risiko van kardiovaskulere siekte gedui. Die resultate het dus bewys dat lae inkomste, huishoudelike voedselinsekuriteit en die risikofaktore wat met wanvoeding en leefstylsiektes geassosieer word, teenwoordig was.
During the 1980s, the average life expectancy at birth for South Africans increased steadily. However, the mortality impact of the country's severe Acquired Immune Deficiency Syndrome (AIDS) epidemic is evident in the considerable drop in life expectancy from 61.6 to a projected low of 49.7 in 2006 (Steyn, Bradshaw, Norman, Joubert, Schneider & Steyn, 2006:9). Nevertheless, it is estimated that 2.9 million people in South Africa (SA) are 60 years and older, constituting 6.2% of the total population (Charlton, Bourne, Steyn & Laubscher, 2001:31). The World Health Organization (WHO) defines "elderly" as all persons over the age of 60. In 1980, 8.5% of the world population was elderly, increasing to 9.4% in 1990 and 11% in 2000. By 2020, it is projected that of the total global population of 7.5 billion people, 13.3% will be elderly (Solomons, 2001:1).
Given the multiplicity of environments, nature of societal changes, globalisation and the genetic and evolutionary experience across regions, generalisation about the health of the growing elderly population is complex (Solomons, 2001:1). It is, however, certain that the increasing number of elderly people in developing countries will be vulnerable to the health problems that are associated with low-income societies, and that their diet and nutritional status will interact with these conditions. Ageing individuals may be intrinsically vulnerable to undernutrition and its associated infectious diseases, as well as to overnutrition and the risks associated with chronic diseases of lifestyle, thus a double burden of disease (Solomons, 2001:2). People who live at subsistence levels often have no choice but to consume monotonous diets that are poor in nutrients. Impoverished people in cities often consume fatty and sugary foods that are more affordable (Cannon, 2001:1). Charlton, Kolbe-Alexander and Nel (2005:1040) recently demonstrated a nutrient-diluting effect of added sugars in elderly black South African women.
Increased urbanisation among the black population in SA has led to significant increases in diseases of lifestyle (Vorster, 2002:243; Van Rooyen, Kruger, Huisman, Wissing, Margetts, Venter & Vorster, 2000:779). The prevalence of the malnutrition problem amongst the elderly in SA is not clearly defined owing to the absence of a national nutrition surveillance programme. The only data available consists of single fragmented surveys that have been undertaken amongst isolated groups. There is thus an urgent need in SA for research on the underlying causes of malnutrition and food insecurity in the elderly (Lemke, Jansen van Rensburg, Vorster & Zichea, 2001:21), as it has been recognised that proper nutrition and physical activity can extend people's lives and that nutrition intervention can assist in the promotion of healthier ageing, both in the prevention and management of chronic diseases and their consequences (Dausch, 2003:683).
In view of these facts and the present situation, it is strongly argued that a baseline survey with a follow-up nutrition intervention is a highly relevant endeavour in the case of the elderly in Sharpeville, with nutrition education included in all the phases of the project. Sharpeville is situated in the Vaal Region, an industrial, polluted area approximately 70 km south of Johannesburg, with a population of 794 599 people, 47.9% of whom are unemployed and of which 46.1% of households live in poverty (McIlrath & Slabbert, 2003:13,21). The main objective of this study was a comprehensive nutrition and health assessment to provide a basis for the implementation of intervention strategies for the elderly population. The article consequently focuses on the socio-demographic and health profile, including the nutritional status, of the elderly persons attending a newly established (three months old) day-care centre two days a week (Mondays and Wednesdays) in Sharpeville. The day-care centre offers skills training and religious activities aimed at the low-income elderly (aged [greater than or equal to] 60 years) as well as breakfast and lunch on the days that the subjects attend the centre. The results of this project will be used when planning appropriate intervention programmes for the elderly in this community, commencing with the elderly attending this care centre as a pilot study and ultimately assisting in the fight against disease and malnutrition, thereby contributing to the national health plan aimed at improving the health care system for all South Africans.
Sampling and respondents
Before this cross-sectional baseline survey was conducted, introductory visits were made to the daycare centre for the elderly in Sharpeville for observation purposes and to introduce the researchers, explain the objectives of the project and obtain consent for the project from the elderly persons attending the centre. The Medical Ethics Committee for research on human beings of the University of the Witwatersrand approved the study (R14/49).
The sample size calculation (The Survey System, n.d.) used for this study was as follows:
Sample size = [Z.sup.2] * (p) * (1-p)/[c.sup.2]
Z = Z value (e.g. 1.96 for 95% confidence level)
p = percentage picking a choice, expressed as decimal (p=0.5 used for sample size needed)
c = confidence interval, expressed as decimal (e.g. 0.05 = 5)
A total of 169 respondents were thus needed for this cross-sectional survey to obtain statistically representative data for this community. However, 170 men and women were randomly selected for the survey from an alphabetical list of names provided by the care centre (every second name). Eight fieldworkers, speaking the various indigenous languages of SA, were recruited and trained using a training manual and participatory facilitating methods. The data from 169 questionnaires were completed and analysed.
Characteristics of participants
A socio-demographic and health questionnaire was compiled in English. Reproducibility of the questionnaire was tested by having the same ten elderly persons complete one questionnaire each week for a period of four weeks and comparing the answers. Based on the results the questionnaire was accepted to be reproducible as a high correlation was found (r>0.6, p [less than or equal to] 0.05) for the variables of marital status, type of house, monthly income, medication and number of household income contributors. All the respondents were interviewed by the fieldworkers to obtain demographic data such as age, gender of the respondents in the household, home language, levels of education, health profiles and socio-economic data. The activity levels were determined by administering an adapted, validated activity questionnaire used by the Florida International University for the programme "Eat Better & Move More" for the elderly (Wellman, Weddle, Sanchez & Rosenzweig, 2004:58).
A pre-validated, structured, 24-hour recall questionnaire (Oldewage-Theron, Dicks, Napier & Rutengwe, 2005:17) was administered twice, a month apart, by the fieldworkers. A limitation of the 24-hour recall is that it does not provide a reliable estimate of an individual's intake owing to day-to-day variation (Margetts & Nelson, 2000:139). However, owing to the advantages of speed and ease of administration and the relatively short attention span of the elderly respondents, the 24-hour recall method was used. Because breakfast and lunch were served on these days, it was decided to complete the 24-hour recall on two occasions for days when the elderly did not attend the care centre (Sundays and Tuesdays) to obtain quantitative, descriptive information about usual food consumption patterns and dietary intake. Food models were used simultaneously to determine portion sizes. An average intake of the two days was calculated for the various nutrients. The main objective of this study was not to determine the food consumption and dietary intake patterns, and differences between weekdays and weekends were thus not calculated for this elderly group of people.
Weight, height and mid-upper arm circumference (MUAC) were measured using standard measurements and body mass index (BMI) was calculated as weight (kg) divided by height squared (m2). Weight was measured on two new Philips electronic bathroom scales model HF350 and height was measured with a Scales 2000 portable stadiometer. A Tanita model BF-522 bioelectrical impedance scale was used to measure body fat percentage. The respondents were fasted and did no exercise 12 hours prior to the measurements to ensure normal hydration, which is a prerequisite for accurate testing. MUAC was measured using a Seca non-stretch tape.
Breakfast was served between 08:00 and 09:00 at the care centre and the elderly indicated that no food was consumed before leaving home for the care centre. One of the requirements for the biochemical analyses was that the respondents had to be fasting and they were advised at the information session held before the project commenced to fast, and were again verbally reminded the day before the biochemical measurements were taken. A poster with all the data collection dates, procedures and requirements was also displayed in the care centre for at least two weeks before the data collection period. However, no proof could be obtained that the subjects did not have anything to drink or eat before the measurements were taken.
A subsample of 60 elderly persons was selected randomly for the biochemical data collection. Blood samples were taken by qualified nursing sisters using a Vacutainer needle from the vena cephalica of seated subjects after an 8-12 hour fast. Blood pressure and body temperature were measured by the same nursing sisters using standardised techniques.
The blood was separated within two hours of blood collection. Two medical technologists continuously audited the separating procedure. Serum for the analyses of ferritin, total protein, albumin, vitamin B12 and folate was stored at -10[degrees]C until analysis in the laboratories of the Vaal University of Technology. Serum for retinol, vitamin E and zinc analyses was covered with aluminium foil and stored at -10 [degrees]C until it was transported to the Nutritional Intervention Research Unit of the Medical Research Council (MRC) in Cape Town.
All blood parameters were analysed according to standard protocol. The following analyses were performed: haematocrit (Hct) (numeric integration [Coulter counter ABX [MICROS.sub.CT]]), haemoglobin (Hb) (cyanmethaemoglobin colorimetric method [Coulter counter ABX [MICROS.sub.CT]]), red blood cell count (RBC) (Coulter counter ABX [MICROS.sub.CT]), serum glucose (colorimetric method [Konelab[TM], GOD-POD]); serum albumin (colorimetric [Konelab[TM], BCG]), and total protein (colorimetric [KonelabTM]), serum folate (immunoturbidity [TOSHO, AIA-PACK B12]), vitamin B12 (immunoturbidity [TOSHO, AIA-PACK B12]), retinol (high performance liquid chromatography (HPLC)), iron (colorimetric [Roche Unimate 5 Iron]), ferritin (immunoturbidometric method [Roche Unimate 3 FERR]), zinc (non-diluted serum flame atomic absorption spectrophotometry), total cholesterol and triglycerides (homogenous enzymatic colorimetric [Konelab[TM]]).
Data analysis was done using the Statistical Package for Social Sciences (SPSS) for Windows version 10.0 program for all variables except dietary intake data. Dietary intake and food consumption data were analysed by a registered dietician using the Foodfinder[R] version 3 program, developed by the MRC. Daily nutrient intakes are reported as means and standard deviations for the two 24-hour recalls for each subject and for the male and female groups separately. The Levene's t-test for equality of variances was used to evaluate differences between nutrient intake and biochemical variables of men and women. Frequencies were used to determine the percentage of participants with nutrient intakes below the estimated average requirement (EAR) values (Institute of Medicine, 2003:17-88).
In order to assess the validity of the dietary assessment method, reported energy intakes were compared with estimated energy requirements (EER) using the equation suggested by the Institute of Medicine (2003:15) with a physical activity level factor of 1.0 for sedentary men and women.
Characteristics of the respondents The majority of the respondents, aged between 60 and 110 years, were black (100%), widowed (70.4%), women (90.5%), with a mean age of 71.2 years. Only 24.6% had attended secondary and tertiary institutions, indicating a low literacy level. A small percentage lived alone (5%), whilst the majority of respondents shared the house with other family members. The average household size was 4.9 persons. 99% of the respondents lived in brick houses with [less than or equal to] two rooms (29.4%), three to four rooms (40.5%) or more than four rooms (30.1%). The majority of the respondents had resided in Sharpeville permanently for more than five years and had access to clean, safe water, electricity, toilet facilities and waste removal services.
The major health problems experienced by the participants were eye, ear, nose and throat infections, painful joints and chronic headaches. Most of them used chronic medication, of which 29.6% was for the treatment of hypertension. 68% suffered from hypertension ([greater than or equal to] 160/95 mm Hg when measured), however, only 36.8% of the respondents used hypertensive medication. The respondents were not very active as only 14.5% reported heavy exercise/activity levels and 32.3%, 27.4% and 25.8% reported moderate, light or no exercise/activity levels, respectively, as measured by the validated physical activity questionnaire. With regard to smoking and drinking, 88.3% of the respondents never smoked and 88% did not take alcohol. This result could be influenced by the fact that 90.5% of the sample consisted of women. However, a relatively large percentage of the sample used snuff. The results also indicate that the majority of respondents visited the local clinic (63.6%) on foot (64.3%) when ill.
The anthropometric indices of the women are reported here as they were the majority of the sample. The BMI indicated 16.4% normal weight (BMI 18-24.9), 29.5% overweight (BMI 25-29.9), 27.9% obese (BMI 30-34.5) and 26.2% very obese (BMI 35+). The body fat composition indicated that 50% of the women had more than 40% fat. The mean MUAC was 33.4 [+ or -] 0.7 cm, falling between the 75th and 90th percentile of the United States Health and Nutrition Examination Survey (NHANES 1) for the elderly between 65 and 74.5 years old (Mahan & Escott-Stump, 2000:1189-1190). This is further proof of obesity in this sample.
The biochemical data (Table 1) indicated that the majority of respondents had normal haematological indices. The mean serum triglyceride level was 1.2 [+ or -] 0.6 mmol/l, which was within the normal range. Although the mean serum cholesterol level was 5.4 [+ or -] 1.4 mmol/l, indicating borderline risk for cardiovascular disease (CVD), the majority of the elderly had normal cholesterol levels (<5.2 mmol/l), with 41.8% lying within the borderline risk of CVD levels (5.2-6.2 mmol/l). A significantly higher percentage of women had serum cholesterol levels above the normal cut-off point when compared to the men, thus indicating greater risk for CVD in the female subjects. The majority of the elderly had normal blood glucose levels. However, 22.4% had high levels (>5.9 mmol/l) that could be associated with a risk of diabetes mellitus. The men had statistically significantly higher serum glucose levels (6.4 [+ or -] 3.6 mmol/ l) compared to women (5.2 [+ or -] 2.1) (p [less than or equal to] 0.05). The distribution of serum mineral levels indicated that the majority of respondents had normal iron and ferritin levels, but 73.1% of the subjects had low serum zinc levels (<50 [micro]g/dL) (Yetiser, Tosun, Satar, Arslanhan, Akcam & Ozkaptan, 2002:329-333). However, 42.4% and 3% of the respondents had serum ferritin and iron levels higher than the cut-off point, respectively. Only 20.9% of the respondents had low serum iron levels (<9 and 11.6 [micro]mol/l for women and men, respectively), but 35.8% and 47% had low haematocrit and haemoglobin levels, which could be indicative of iron deficiency anaemia. The majority of the elderly had normal serum vitamin B12, retinol and folate values. The data were further analysed for correlations between BMI and serum glucose levels, cholesterol and triglycerides, but based on the one-tail Pearson correlation test, no statistically significant correlations were found.
Dietary intake and food consumption patterns
The EAR is defined as "the dietary intake that meets the estimated needs of a nutrient for 50% of individuals in a gender specified group, at the given life-stage" (Institute of Medicine, 2003) and is used as the basis for the recommended dietary allowance (RDA). The EAR is usually used to estimate the prevalence of inadequate intakes of nutrients within a group (Institute of Medicine, 2003:8, 11) and, although the majority of households surveyed indicated consumption of three (58.8%) or two (28.8%) meals daily, the nutrient analysis of the diets indicated deficient intakes for a number of nutrients when compared to the EAR. These included dietary fibre, calcium, selenium, vitamins A, [B.sub.6], D, E, folate and biotin. The mean of two 24-hour recall analyses also showed deficient intakes by the female participants of total energy as well as magnesium, zinc, thiamin, riboflavin, niacin, vitamins [B.sub.12], C and pantothenate (Institute of Medicine, 2003:17, 25, 37, 42, 49, 55, 60, 62, 65, 69, 71, 73, 76, 79, 81, 83, 85, 88). Table 3 shows the top 20 most frequently consumed items and the average daily intake of respondents who consumed these foods on the days included in the 24-hour recalls. The majority of food items consumed were carbohydrate-based, and although chicken, beef and eggs appeared as protein sources, these were consumed by a minority of respondents (38, 21 and 24, respectively). Milk was consumed by 73 respondents but the mean daily intake was small (67 g). Although fruit and vegetables also appeared on the top 20 food consumption list, the only fruits that were consumed included apples, oranges, bananas and pears. The majority of elderly persons did not consume any fruit or vegetables. The only vegetables consumed were cabbage, coleslaw, spinach, pumpkin, carrots, beetroot and tomato and onion mix. Not only was the frequency of fruit and vegetable intake very low, but the portions were also very small and did not meet the recommended intake of 400 g per day (Love & Sayed, 2001:S29). This explains the low fibre intake.
The EER is defined as the "average dietary energy intake that is predicted to maintain energy balance in a healthy adult of a given age, gender, weight, height and level of physical activity, consistent with good health" (Institute of Medicine, 2003:15). In this study the EER for sedentary men (6 809 kJ) and women (6 182 kJ) was compared with the mean reported energy intake of men (8 640 kJ) and women (5 394 kJ) to validate the dietary intake data by means of a paired t-test. In the women, there was evidence of underreporting as a statistically significant difference (p [less than or equal to] 0.05) between EER and reported energy intake was found. 61% of the women reported energy intakes of below the EER with the reported intake on average 13% lower than EER. The opposite was found in the men. The reported energy intake of the men was statistically significantly higher compared to the EER (p [<0.05), thus indicating overreporting by 58% with the reported intake on average 26% higher than EER. No statistically significant difference was found between the EER and reported energy intake for the total sample.
The meals supplied by the day-care centre contributed on average 6 292 kJ, 59 g protein, 47 g fat and 212 g carbohydrates. This is an equivalent of 92% and 102% of energy requirements for women and men, respectively, as well as 128% of protein and 212% of carbohydrates when compared to the EAR. Furthermore, the meals provided 216% and 189% of dietary iron and zinc recommendations, respectively (Institute of Medicine, 2003).
Income levels and procurement patterns
All the respondents in the sample received a state pension and the majority had been receiving this for longer than three years. In 4.2% of the cases the partner was employed. The majority of households had a monthly income of between R501 and R1 000 and in most of the households the pensioner was the only contributor to household income. The majority of respondents spent less than R200 per week on food for the household. The results further indicated that in these households the mother (31.2%) or grandmother (54.7%) was responsible for household expenditure. In a relatively large percentage of households the grandmother was responsible for food preparation (40.6%), food procurement decisions (47%), and feeding the children (43.5%), and was regarded as the head of the family (54.7%). In the South African context, it is known that many grandparents have become "silent saviours" of grandchildren whose parents cannot look after them for a variety of reasons, including HIV/AIDS. At least one in five AIDS-affected households is headed by a woman older than 60 years (Steinberg, Johnson & Ndegwa, 2002:12).
The results in Table 4 indicate household food insecurity based on the fact that 7.4% of the respondents reported a chronic money shortage to procure their basic needs, whilst 47.9% often had this problem and 25.1% sometimes did not have enough money for their basic needs. Only a small percentage seldom or never experienced this problem.
The purpose of this study was to determine the demographic and health profile and nutritional status of elderly people attending a care centre in Sharpeville, in order to develop appropriate nutrition intervention programmes to meet their needs and tastes for maximum compliance. A limitation of this study was the small sample of men (n=16) and the results for the men therefore cannot be generalised. Another limitation is that dietary intake was measured on the days that the elderly did not consume a meal at the elderly care centre. The dietary intake results may have been different on days that the elderly attended the care centre.
Sharpeville has a population of 45 000 people (McIlrath & Slabbert, 2003:45) and thus an estimated 3 285 elderly (based on the fact that 7.3% of the South African population is elderly (Joubert & Bradshaw, 2006:204)). Furthermore, not all the elderly in Sharpeville attend care centres and the results of this study therefore cannot be generalised, as this sample of elderly people is not representative of all the elderly living in Sharpeville or the rest of SA.
Obesity was the most outstanding anthropometric feature of the women in this study, exceeding the prevalence reported for black women in the Cape Peninsula (Charlton et al., 2005:1038; Steyn, Jooste, Bourne, Fourie, Badenhorst, Bourne, Langenhoven, Lombard, Truter & Katzenellenbogen, 1991:483) and in the South African Demographic and Health Survey conducted in 1998 (Puoane, Steyn, Bradshaw, Laubscher, Fourie, Lambert & Mbananga, 2002:1044). A high rate of obesity in black South African women has also been reported by researchers in other provinces (Mollentze, Moore, Steyn, Joubert, Steyn, Oosthuizen & Weich, 1995:93; Kruger, Venter & Vorster, 2001:735). About two decades ago, Walker, Walker, Walker and Vorster (1989:226) referred to obesity in these women as "healthy obesity" because adverse sequelae of obesity were found in only 12.5% of obese women and 87.5% were free of any sign of the metabolic syndrome. However, more recently obesity in African women has been associated with an increased risk of noncommunicable diseases (NCDs) (Mollentze et al., 1995:92-94; Kruger et al., 2001:735-737) as was found in the study reported here. There is a growing perception that, in developing countries throughout the world, overnutrition-related chronic diseases such as obesity, diabetes mellitus, CVD and certain forms of cancer often develop before the battle against undernutrition has been won. In SA, the coexistence of undernutrition with overnutrition is evident from the already high prevalence of micronutrient deficiencies accompanied by the very high prevalence of obesity in black women, as well as hypertension and stroke in urban Africans (Oldewage-Theron, 2001:160). It is known that hunger and obesity can exist within the same household (Townsend, 2006:34; Scheier, 2005:883). This is especially true for low-income households, as was found in this community. There is evidence that higher obesity rates tend to be associated with low incomes and low education levels, particularly among women (Wardle, 2002:1230). One explanation for this arises from the effect of prices and incomes on food choices, dietary habits and diet quality. Drewnowski and Specter (2004:11) hypothesised that consuming energy-dense foods and energy-dense diets are an important strategy used by low-income consumers to stretch the food budget. Energy-dense foods carry a lower price tag, which allows for higher energy consumption. They concluded that limited economic resources may shift dietary choices towards an energy-dense, highly palatable diet, as this kind of diet provides maximum calories per the least volume and the least cost. But with the observed mean energy intake in this study, which was actually low in comparison to the EER (Institute of Medicine, 2003), the 'food acquisition cycle' proposed by Townsend, Peerson, Love, Achterberg and Murphy (2001:1741) may explain our observations more appropriately. Food insecure families overeat when food is plentiful (when money for food is available), followed by a short period of involuntary food restriction (when money is in short supply), followed by overeating. This could be a pattern that results in gradual weight gain over time. According to Olsen (1999:S523), the relationship between food insecurity and obesity is a "complicated and politically charged topic". The chronic ups and downs in the economic cycle of households that show fiscal constraint cause these people to eat more when food is available (Polivy, 1996:590).
The socio-economic status of the participants in this study was poor. Although all the elderly persons who participated in the study received a monthly pension, they were the only contributors to household income in most of the households and the majority of households had a monthly income of between R501 and R1 000. More than 80% of the respondents reported an occasional shortage of funds for basic household needs, which confirmed the presence of food insecurity. Most of the households spent less than R200 per week on food. Taking into consideration that the average household size was 4.9 people, spending on food was calculated to be less than R5,80 per person per day. This is equivalent to a loaf of bread or a litre of milk. This was also evident from the type of foods consumed. The top 20 food consumption list indicates that the majority of food items consumed were carbohydrate-based with a low frequency of small portions of fruit and vegetables, not meeting the recommended intake of 400 g per day (Love & Sayed, 2001:S29). This is in agreement with the THUSA (Transition in Health during Urbanisation in South Africa) study, in which regular fruit and vegetable consumption was found only in the upper class urban stratum (MacIntyre, Kruger, Venter & Vorster, 2002:250).
Although the mean daily protein intake was sufficient, about half of the protein intake of the women was derived from plant sources. Furthermore, the intakes of the women were deficient for total energy and dietary fibre, as well as a large number of micronutrients. These results correspond with similar studies conducted amongst black elderly persons in South Africa (Charlton et al., 2005:2034) and in the THUSA study (MacIntyre et al., 2002:244-246). However, the very low zinc status (dietary intake as well as serum values) was an unexpected finding. Zinc has been one of the micronutrients in enriched maize meal in SA by law since April 2003 in amounts of 1.89 to 2.66 mg per 100 g raw maize meal, depending upon the degree of refinement. For stiff maize porridge, this amounts to about 1.9 mg per 100 g (Department of Health, 2003:5). The mean intake of maize porridge in the study was 273 g, supplying about 5.2 mg zinc, compared to the RDA of 8 and 11 mg for women and men, respectively. However, very few other dietary sources of zinc were included in the diets of the respondents. Thus the predominant food source of zinc for these elderly was maize meal. However, the bioavailability of zinc is better from animal sources than plant sources. Furthermore, the presence of phytate in diets can reduce zinc absorption. Poor bioavailability of zinc has been reported among populations consuming a predominantly maize-based diet and this is a hindrance to achieving adequate zinc nutriture (Gibson, 2005:712). Cereals contain a high content of the anti-nutritional factor phytate (Gibson, Perlas & Hotz 2006:160; Manary, Hotz, Krebs, Gibson, Westcott, Broadhead & Hambidge, 2002:1057), which reduces the bioavailability of zinc. Samples of maize meal from six provinces in South Africa were recently analysed for their phytate content at the North-West University, Potchefstroom, and verified by an agricultural research laboratory. The phytate content ranged from 1 237-1 631 mg/100 g maize meal, (Pisa, 2006:32), which is substantially higher than the content reported by Ferguson, Gibson, Thompson, Ounpuu and Berry (1988:320) for East African maize meal (792 mg/ 100 g). The inhibitory effect of phytate on zinc absorption is due to it forming insoluble complexes with zinc in the gastrointestinal tract (Gibson, 2005:714; Manary et al., 2002:1057). Manary and co-authors (2002:1057) found an inhibitory effect of habitual high dietary phytate intake on zinc homeostasis in Malawian children. Furthermore, the molar ratio phytate:zinc can be used as a determinant of zinc bioavailability from cereal-based meals. The mean phytate:zinc molar ratio of maize samples from the Vaal region was 44 (Pisa, 2006:33), which fell well above the ratio for optimal relative bioavailability of 15 (Navert, Sandstrom & Cederblad, 1985:52). In view of these considerations, reduced bioavailability may, therefore, partly explain why low serum zinc values were common.
The health status of the respondents was also compromised. Although smoking and alcohol consumption were relatively low, environmentally this area suffers high pollution rates as it is an industrial area. A large number of elderly persons were taking chronic medication and suffered from a number of disorders including painful joints, ear, nose and throat infections and chronic headaches. Although 40.6% of the respondents received chronic blood pressure medication, only 10% had a normal blood pressure. The high prevalence of hypertension in this study corresponds with the THUSA population (Van Rooyen et al., 2000:783). A study conducted in KwaZulu-Natal also found the black population had a high prevalence of hypertension (25%), higher than in any of the other population groups in SA (Seedat & Seedat, 1982:62). Recently, Vorster (2002:239) reviewed the emergence of CVD in urbanisation of Africans. It appeared that mortality rates from CVD confirmed that stroke is a major public health problem amongst black South Africans, possibly because of an increase in hypertension, obesity, smoking and hyperfibrinogenaemia in urbanisation. Available data further suggested that black South Africans might be protected against ischaemic heart disease (IHD) because of favourable serum lipid profiles (low total cholesterol and high ratios of high-density lipoprotein cholesterol) and low homocysteine values (Vorster, 2002:242). However, in the study reported here, almost half of the women and a third of the men had total serum cholesterol values above defined cut-off points, increasing the IHD risk profile. This adds urgency to the efforts suggested by Mollentze et al. (1995:95) to take measures to prevent an epidemic of atherosclerotic vascular disease in the black population. Communities with a low socio-economic status, such as in this study, are particularly vulnerable given the relationship between CVD and socio-economic status reported in the literature (Strike & Steptoe, 2004:338).
Older adults are known to be at an increased risk for impaired nutritional status with increasing age. However, in SA, the elderly are not considered a priority when planning nutrition interventions and as a result, the impact and effectiveness of such studies have not been described for this population (Charlton & Rose, 2001:2424S). Poor dietary intake, especially of zinc, as shown to be a problem in this particular community, may result in impaired immunity which will lead to an increased risk of infectious disease (Cowan, Roberts, Fitzpatrick, While & Baldwin, 2004:229; Bernstein, Tucker, Ryan, O'Neill, Clements, Nelson, Evans & Fiatarone Singh, 2002:1096-7). While these adverse effects are applicable to all age groups, the elderly group is especially at risk and the many side effects of malnutrition may exacerbate one another, particularly in frail elderly people (Cowan et al., 2004:229). However, in a climate where HIV/AIDS is the major public health problem consuming the largest portion of the health budget, and policies promoting the wellbeing of the elderly are not considered a priority, affordable, effective and culturally sensitive programmes remain a major challenge.
The findings of this study confirm that poverty, malnutrition, both undernutrition and overnutrition, as well as household food insecurity and poor health were the major problems observed in this elderly community. These findings correspond to other studies, however limited, conducted amongst the elderly in SA (Charlton, 2000:S33) and confirm the need to educate the older adults in this community to enable them to modify their food procurement patterns as well as their dietary practices to address the high prevalence of obesity and associated risk of hypertension and diabetes mellitus. Economics remains a critical issue as it will influence which foods are bought and also where people can afford to live and thus their proximity to food stores and outlets, as well as to public health services. Counselling on food procurement and preparation skills should thus accompany nutrition education (Sayhoun, Pratt & Anderson, 2004:67). Researchers have demonstrated that nutrition education for the elderly is necessary, as well as possible, to prevent or delay the spiral towards ill health and thus disability (Sayhoun et al., 2004:67). Obesity prevention or remediation may be especially challenging in black elderly people because of the positive traditional and cultural connotations ascribed to obesity (Mvo, Dick & Steyn, 1999:27). In a traditional African context, an obese figure is often regarded as a sign of affluence and happiness. With the prevalence of HIV/AIDS that is increasing in the current South African situation, obesity even seems to be observed as an indication of a person's health as weight loss is often associated with HIV/AIDS (Mvo et al., 1999:30).
The results of this study will form the basis for planning and implementing sustainable nutrition intervention and education programmes, to promote public health amongst this group of elderly in the Vaal Region. An intervention study addressing the prevalent zinc deficiency in this elderly community is also needed. Zinc is important for immunity (Haase, Mocchegiani & Rink, 2006:426; Sandstead, Henriksen, Greger, Prasad & Good, 1982:1054) and should this be addressed, this could also lead to a healthier community (Prasad, Beck, Bao, Fitzgerald, Snell, Steinberg & Cardozo, 2007:840). A short-term multi-micronutrient supplementation programme should be implemented to build up the depleted zinc and iron stores, followed by a long-term food-based intervention to maintain the serum zinc and iron levels. A cost-effective way of increasing the zinc intake would be to include more legumes in the diet as these prove to be good sources of zinc and iron. The zinc content of 100 g cooked sugar beans is 1.06 mg compared to 1.53 mg, 1.27 mg, 1.0 mg and 1.15 mg of 100 g of cooked chickpeas, lentils, split peas and soybeans, respectively. The iron content for the same food items is 2.1 mg, 2.9 mg, 3.3 mg, 1.3 mg and 5.1 mg, respectively (Langenhoven, Kruger, Gouws & Faber, 1991:149). Improving the nutritional status of the elderly through nutrition interventions may result in physical and cognitive functional ability (Gray, Hanlon, Landerman, Artz, Schmader & Fillenbaum, 2003:3, 6; Huskisson, Maggini & Ruf, 2007:1; Marcellini, Giuli, Papa, Gagliardi, Dedoussis, Herbein, Fulop, Monti, Rink, Jatje & Mocchegiani, 2006:339), as well as cost savings related to medical care and utilisation of limited health care resources in SA (Charlton & Rose, 2001:2427S).
We hereby acknowledge the Department of Health in the Vaal Triangle for their cooperation, the Vaal University of Technology and National Research Foundation for funding this project, as well as the management and participants of the Elderly Care Centre in Sharpeville. We want to furthermore acknowledge Tom Ndanu (bio-statistician), Verena Nolan (statistician) and Lizelle Oosthuizen (dietician and research assistant) for their valuable assistance.
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Prof. Wilna H Oldewage-Theron
BSc (Hons), MSc, PhD (Dietetics) PGDip (Hospital Dietetics)
Director: Institute of Sustainable Livelihoods, Vaal University of Technology, Vanderbijlpark
Corresponding author: firstname.lastname@example.org
Dr Lilian Salami
BSc (Hons), MSc (Food and Nutrition), PhD (Nutrition), PGDip (Education)
Postdoctoral fellow: Institute of Sustainable Livelihoods, Vaal University of Technology, Vanderbijlpark
Dr Francis B Zotor
BSc (Hons), MSc (Biotechnology), PhD (Nutrition), PGDip (Higher Education)
Postdoctoral fellow: Institute of Sustainable Livelihoods, Vaal University of Technology, Vanderbijlpark
Prof. Christine Venter
BSc (Hons), MSc, DSc (Dietetics/Nutrition), BSc (Physiology)
Consultant Research Professor: Institute of Sustainable Livelihoods, Vaal University of Technology, Vanderbijlpark
Table 1: Selected biochemical indices of a sample of the elderly subjects (n=67) Parameter Normal Women range (n=49) Mean [+ or -] SD Total serum iron (#) 10/30/08 15.7 [+ or -] 7.9 [micro]mol/l Serum 18-250 179.3 [+ or -] 289.8 ferritin ([section]) ng/ml (m) 12-160 ng/ml (w) Haemoglobin (#) 13.5-17.5 13.6 [+ or -] 1.6 g/dl (m) 11.5-15.5 g/dl (w) Haematocrit (#) 40-52 % 41.7 [+ or -] 4.0 (m) 36-48% (w) Serum zinc (^) 50-150 65.8 [+ or -] 7.9 [micro]g/dl Serum folate 5.9-45.4 15.0 [+ or -] 6.9 ([paragraph]) nmol/l Serum retinol 20-30 [micro]g/dl 57.3 [+ or -] 17.3 ([paragraph]) Vitamin [B.sub.12] 156-672 333.3 [+ or -] 141.0 ([paragraph]) pmol/l Parameter Women Men (%) (n=18) with low Mean [+ or -] SD values Total serum iron (#) 18.4 16.6 [+ or -] 7.4 Serum 4.2 177.6 [+ or -] 190.9 ferritin ([section]) Haemoglobin (#) 40.8 13.6 [+ or -] 1.9 Haematocrit (#) 30.6 42.0 [+ or -] 5.4 Serum zinc (^) 69.4 62.4 [+ or -] 11.7 Serum folate 0 13.6 [+ or -] 5.4 ([paragraph]) Serum retinol 0 51.6 [+ or -] 14.1 ([paragraph]) Vitamin [B.sub.12] 2.1 332.3 [+ or -] 120.2 ([paragraph]) Parameter Men Total (%) (n=67) with low Mean [+ or -] SD values Total serum iron (#) 27.8 16.0 [+ or -] 7.8 Serum 5.6 178.9 [+ or -] 265.1 ferritin ([section]) Haemoglobin (#) 55.6 13.6 [+ or -] 1.6 Haematocrit (#) 38.9 41.8 [+ or -] 4.4 Serum zinc (^) 83.3 64.9 [+ or -] 9.1 Serum folate 0 14.6 [+ or -] 6.5 ([paragraph]) Serum retinol 0 55.8 [+ or -] 16.6 ([paragraph]) Vitamin [B.sub.12] 5.6 333.1 [+ or -] 134.8 ([paragraph]) Parameter Total group (%) with low */ high ** values Total serum iron (#) 20.9 */ 3.0 ** Serum 4.5 */ ferritin ([section]) 42.4 ** Haemoglobin (#) 44.8 */1.5 ** Haematocrit (#) 32.8 */3.0 ** Serum zinc (^) 73.1 */0 ** Serum folate 0 ([paragraph]) Serum retinol 0 ([paragraph]) Vitamin [B.sub.12] 3 */1.5 ** ([paragraph]) No statistically significant difference between men and women were found at p?0.05 (Levene's test for equality of variances) ((#) Hoffbrand et al. 2001:331; ([section]) Konelab 20i reagent Kits; ([paragraph]) SA Medical Research Council, (^) Yetiser, et al. 2002:329-333) * Low values, ** high values (compared to normal range) Table 2: Analysis of two 24-hour recalls: mean daily intakes of a sample of the elderly subjects (n=101) Nutrient Women Women (mean [+ or -] SD) (%) (n=81) <100 % of EAR Energy (kJ) 5394 [+ or -] 2946 * 61 Total protein (g) 47 [+ or -] 31 * 54 Plant protein (g) 21 [+ or -] 13 * Animal protein 26 [+ or -] 27 * (g) Total fat (g) 28 [+ or -] 21 * Cholesterol (mg) 124.6 [+ or -] 151.5 * Carbohydrates 196.4 [+ or -] 122.8 * 19 (g) Total dietary fibre (g) 12 [+ or -] 7 ** 86 Calcium (mg) 214.6 [+ or -] 209.8 100 Iron (mg) 5.5 [+ or -] 3.3 ** 47 Magnesium (mg) 222.8 [+ or -] 124.8 ** 61 Zinc (mg) 5.8 [+ or -] 3.7 ** 60 Copper (mg) 0.6 [+ or -] 0.3 ** Chromium ([micro]g) 21.4 [+ or -] 29.6 ** 57 Selenium ([micro]g) 19.1 [+ or -] 17.2 * 86 Vitamin A 361.1 [+ or -] 765.7 80 ([micro]g RE) Thiamin (mg) 0.8 [+ or -] 0.5 * 61 Riboflavin (mg) 0.7 [+ or -] 0.8 79 Niacin (mg) 9.8 [+ or -] 6.8 ** 59 Vitamin B6 (mg) 0.7 [+ or -] 0.5 87 Folate ([micro]g) 136.3 [+ or -] 124.9 89 Vitamin [B.sub.12] 1.9 [+ or -] 3.1 67 ([micro]g) Pantothenate 3.6 [+ or -] 3.1 ** 69 (mg) Biotin ([micro]g) 19.4 [+ or -] 27.6 84 Vitamin C (mg) 32.4 [+ or -] 69.7 83 Vitamin D ([micro]g) 1.2 [+ or -] 2.1 ** 100 Vitamin E (mg) 3.9 [+ or -] 6.7 99 Nutrient Men Men (mean [+ or -] SD) (%) (n=20) <100 % of EAR Energy (kJ) 8640 [+ or -] 3799 * 42 Total protein (g) 86 [+ or -] 48 * 27 Plant protein (g) 32 [+ or -] 14 * Animal protein 54 [+ or -] 41 * (g) Total fat (g) 49 [+ or -] 32 * Cholesterol (mg) 260.7 [+ or -] 217.2 * Carbohydrates 300.9 [+ or -] 138.5 * 4 (g) Total dietary fibre (g) 15 [+ or -] 6 ** 85 Calcium (mg) 238.7 [+ or -] 240.6 100 Iron (mg) 8.5 [+ or -] 4.3 ** 23 Magnesium (mg) 318.2 [+ or -] 127.1 ** 35 Zinc (mg) 11.5 [+ or -] 8.2 ** 35 Copper (mg) 0.9 [+ or -] 0.4 ** Chromium ([micro]g) 60.4 [+ or -] 51.2 ** 35 Selenium ([micro]g) 42.2 [+ or -] 27.5 * 65 Vitamin A 447.7 [+ or -] 746.3 77 ([micro]g RE) Thiamin (mg) 1.3 [+ or -] 0.6 * 35 Riboflavin (mg) 0.9 [+ or -] 0.6 58 Niacin (mg) 16.8 [+ or -] 9.0 ** 23 Vitamin B6 (mg) 1.2 [+ or -] 0.9 73 Folate ([micro]g) 165.5 [+ or -] 99.5 92 Vitamin [B.sub.12] 3.3 [+ or -] 3.2 50 ([micro]g) Pantothenate 5.9 [+ or -] 4.0 ** 65 (mg) Biotin ([micro]g) 25.9 [+ or -] 12.0 62 Vitamin C (mg) 65.6 [+ or -] 166.2 85 Vitamin D ([micro]g) 3.3 [+ or -] 3.9 ** 100 Vitamin E (mg) 6.3 [+ or -] 5.9 88 Nutrient Total group Total (mean [+ or -] SD) group (n=101) (%) <100 % of EAR Energy (kJ) 6036 [+ or -] 3372 58 Total protein (g) 55 [+ or -] 38 47 Plant protein (g) 23 [+ or -] 14 Animal protein 32 [+ or -] 32 (g) Total fat (g) 32 [+ or -] 25 Cholesterol (mg) 151.5 [+ or -] 174.1 Carbohydrates 217 [+ or -] 132 15 (g) Total dietary fibre (g) 12 [+ or -] 7 85 Calcium (mg) 219.3 [+ or -] 215.2 100 Iron (mg) 6.1 [+ or -] 3.7 41 Magnesium (mg) 241.7 [+ or -] 130.4 54 Zinc (mg) 6.9 [+ or -] 5.4 53 Copper (mg) 0.6 [+ or -] 0.4 Chromium ([micro]g) 29.1 [+ or -] 38.0 51 Selenium ([micro]g) 23.7 [+ or -] 21.6 81 Vitamin A 378.3 [+ or -] 759.0 78 ([micro]g RE) Thiamin (mg) 0.9 [+ or -] 0.6 56 Riboflavin (mg) 0.7 [+ or -] 0.8 64 Niacin (mg) 11.1 [+ or -] 7.8 50 Vitamin B6 (mg) 0.8 [+ or -] 0.6 78 Folate ([micro]g) 142.0 [+ or -] 120.4 90 Vitamin [B.sub.12] 2.2 [+ or -] 3.1 61 ([micro]g) Pantothenate 4.1 [+ or -] 3.4 68 (mg) Biotin ([micro]g) 20.7 [+ or -] 25.4 79 Vitamin C (mg) 39.0 [+ or -] 96.5 83 Vitamin D ([micro]g) 1.6 [+ or -] 2.7 100 Vitamin E (mg) 4.4 [+ or -] 6.6 98 Nutrient EAR ([paragraph]) Energy (kJ) 6182 (w) 6809 (m) ([infinity]) Total protein (g) 46 Plant protein (g) Animal protein (g) Total fat (g) Cholesterol (mg) Carbohydrates 100 (g) Total dietary fibre (g) 21 (#) Calcium (mg) 1200 (#) Iron (mg) 5 Magnesium (mg) 265 Zinc (mg) 6.8 Copper (mg) Chromium ([micro]g) 20 (#) Selenium ([micro]g) 45 Vitamin A 500 ([micro]g RE) Thiamin (mg) 0.9 Riboflavin (mg) 0.9 Niacin (mg) 11 Vitamin B6 (mg) 1.3 Folate ([micro]g) 320 Vitamin [B.sub.12] 2 ([micro]g) Pantothenate 5 (#) (mg) Biotin ([micro]g) 30 (#) Vitamin C (mg) 60 Vitamin D ([micro]g) 10 (#) Vitamin E (mg) 12 * Statistically significant difference between men and women at p [less than or equal to] 0.01 (Levene's test for equality of variances) ** Statistically significant difference between men and women at p [less than or equal to] 0.05 (Levene's test for equality of variances) ([infinity]) Estimated Energy Requirements (Institute of Medicine, 2003) for sedentary men aged 71.3 years, height =1.67m and weight = 76.3 kg and females of 71.8 years, height = 1.6 m and 75.8 kg ([dagger]) Estimated Average Requirement for females aged 51-70 years old (#) Adequate Intake levels for females aged 51-70 years old (Institute of Medicine, 2003) Table 3: Top 20 food items consumed measured by 24-hour Food item Mean daily intake Number of (gram per person respondents with consuming these daily consumption foods) Tea, brewed 299 119 Maize meal, cooked, stiff porridge 273 79 Brown bread/rolls 93 89 Milk, full cream, fresh 67 73 Chicken 103 38 Beef 125 21 Fermented maize drink (mageu) 212 15 Egg, cooked 123 24 Apple 160 15 Orange 189 11 Maltabella, cooked (sorghum) 281 6 Coffee, brewed, instant 267 6 Potato, boiled 105 15 Sugar, white 16 95 Cold drink, carbonated 280 5 Soup, bean and meat 321 4 Orange Juice 319 4 Rice, white, cooked 87 14 Cabbage, cooked 46 22 Spinach, cooked 49 18 Table 4: Food procurement and preparation patterns of the sample (n=169) Variable N % Frequency of food shopping 170 100 Every day 8 4.7 Once a week 12 7 Once a month 139 81.8 When money available 11 6.5 Place where food is bought most of the time 170 100 Spaza shop 9 5.3 Street vendor 4 2.4 Supermarket 116 68.2 Spaza shop & street vendor 3 1.8 Spaza shop & supermarket 7 4.1 Street vendor & supermarket 18 10.6 Market 13 7.6 Weekly food expenditure 160 100 RO -R50 0-8 US$ 30 18.8 R51-R100 9-15 USS 34 21.2 R101-R 150 16-23 US$ 18 11.2 R151-R200 24-30 US$ 19 11.9 >R 200 30 USS 32 20 Do not know 27 16.9 Household member responsible for food 170 100 preparation Mother 74 43.5 Grandmother 69 40.6 Other (mother, father, caregiver, child 27 15.9 Household member responsible for food 170 100 procurement decisions Mother 44 25.9 Grandmother 30 47 Other mother, father, caregiver, child 46 27.1 Household member responsible for feeding the 170 100 children Mother 63 37.1 Grandmother 74 43.5 Other (mother, father, caregiver, child 33 19.4 Reported head of the household 170 100 Mother 53 31.2 Grandmother 93 54.7 Other (mother, father, caregiver in absence of 24 14.1 family) Number of meals served per household per day 170 100 1 10 5.9 2 49 28.8 3 100 58.8 >3 11 65 Place where most of the food is consumed 170 100 Home 170 100 Frequency of money shortage for basic needs 163 100 in household Always 12 7.4 Often 78 47.9 Sometimes 41 25.1 Seldom 17 10.4 Never 15 9.2